--- /dev/null
+input gdd;
+input gdd-rep;
+input gdd-lbl;
+input gdd-tra;
+input svgnames;
+
+lblPreambule := "\usepackage[frenchb]{babel}" &
+ "\usepackage[garamond]{mathdesign}" &
+ "\usepackage{amsmath}";
+
+input gdd-fct;
+input gdd-plt;
+
+labeloffset := 6;
+gddU:=1.2cm;
+
+vardef f(expr t) = t/sqrt(1+t*t) enddef;
+vardef g(expr t) = t*(1+f(t)) enddef;
+vardef h(expr t) = -t*(1+f(t)) enddef;
+
+def avecCrayon(expr t,c) = withpen pencircle scaled t withcolor c enddef;
+
+
+
+beginfig(1);
+
+
+ Repere(6,10,3,5,2,2);
+ Axes;
+ Debut;
+ Graduations; Unites(1);
+
+ trace Droite((1,-2),(1,2)) withcolor MidnightBlue;
+
+ trace (-1,0)..Courbe(f,g,-18,18,200) avecCrayon(1.5,DarkSalmon);
+ trace (-1,0)..Courbe(f,h,-18,18,200) avecCrayon(1.5,DarkSalmon);
+
+ pointe Point(0,0);
+
+ Fin;
+
+
+endfig;
+
+end
\ No newline at end of file